Rubber tire.



No. 759,456. PATENTED MAY 10, 1904. A. H. MARKS.

RUBBER TIRE.

APPLICATION FILED SEPT. 23, 1903.

H0 MODEL.

. ,ffii/@716074 Patented. May 10, 1904.

PATENT` OEEICE.

ARTHUR H. MARKS, OF AKRON, OHIO.

RUBBER TIRE.

SPECIFICATION forming part of Letters Patent N 0. 759,456, dated May 10,1904. Application iiled Septexnher 23, 1903. Serial No. 174,256. (Nomodel.)

I Rubber tires lwhen in use are subjected to great strains which tend totear them apart and from the wheel-rims. This is especially true whenthe tire is, as some tires are, made wholly of the resilient rubbercompound which is necessarily employed for the tread portion thereof.Such tires are very frequently torn `by the fastening device employedfor securing them on the wheel-rim and are always worn more or less bysuch devices, so that sooner or later the fastening devices cannot holdthe tires upon the wheel-rims. To obviate to some extent this specificform of injury, such tires have been formed with a tread portioncomposed of resilient rubber compound and with a relatively tough andstiff base portion made up of a plurality of layers of fabric, such ascanvas, coated and impregnated with a rubber compound, the entire tireso made up being vulcanized. Such tires are improvements upon tires madeof the resilient rubber compound only but they are nevertheless not asstrong and durable as is desirable. The various plies forming the baseof such a tire are held together only by the cementing action of thevulcanized rubber, and this is also the only means by which the treadportion is secured upon the base. This tread portion is thereforefrequently torn from the base, because the cementing action of therubber is not suflicient to prevent such action, and, moreover, thedifferent plies of the base are not infrequently torn apart.

The object of the present invention is to provide a tire having a strongand stiff base and a relatively resilient tread portion, so constructedthat said base and tread portions will not be torn apart in use and inwhich the various plies of the base will not becomeseparated.

The invention may be said generally to consist of a rubber tireconsisting of a flexible tread portion and a relatively strong and stiffbase portion, which is interlocked with said tread portion by means ofprojections on one of said parts which enter the other.

The invention also consists in the more specific characteristics ofconstruction herenafter described, and definitely pointed out in theclaims.

In the drawings, Figure 1 is a transverse sectional View of a tireembodying my invention seated and secured in a wheel-rim of familiarform. Fig. 2 is a plan view thereof, with some of the tread portionbroken away to disclose the base; and Fig. 3 is a sectional View in theplane indicated by line 3 3 of Fig. 1.

Referring to the parts by. letters, A represents the tread portion ofthe tire, which may be made of any suitable rubber compound.

B represents the base portion, which is made of a plurality of layers ofstrong friction, as canvas, coated and impregnated with rubber. In thisbase are a plurality of holes b. These may be made of any desired shape;but preferably those of one row are staggered in respect to those ofadjacent transverse rows. Fitted into .these holes are dovetailedtongues a, which are homogeneous parts of the tread portion of the tire.

In constructing this tire, the base being first formed of unvulcanizedfriction-that is to say, fabric covered with unvulcanized rubber thetread portion A, formed of unvulcanized-rubber compound, is placedthereon and by pressure is caused to flow into and fill said holes, orthe holes may be filled with said compound and the tread ,portion of thetire placed upon the base, wherefore it will unite with the upper end ofthe rubber in said holes. The entire tire is then vulcanized. Thesetongues lock together the various layers of ,friction constituting thebase, and they also lock the tread portion to this base.

In the construction shown still greater provision is made for resistingthe wear of the fastening devices. These fastening devices are wires CC, which bear directly upon the woVen-wire-fabric strips I), which areembedded in the tire upon the base and between it and the tread portion.The rubber com- IOO pound constituting the tread portion and its tonguespass through the holes in this wire fabric. These wire-fabric strips donot, there.- fore, to any appreciable extent weaken the connectionbetween the tread and the base,

but they do lby reason of their superior weari ing qualities prevent thetire from being torn by the fastening-wires.

E represents the flanged wheel-rim in which the tire is'secured by saidwires, which rest on the projecting ends of said wirefabric strips. n v

Having described my invention, I claim l. A vulcanized-rubber tireconsisting of a relatively tough and stiff base portion and a resilienttread portion, 'said two parts of the and stiff base portion, which twoparts are interlocked by means of undercut holes in the base portion anddovetailed tongues, which are homogeneous parts of the tread portion,and which project down into and lill said holes.

4. A vulcanized-rubber tire consisting of a flexible tread portion, anda relatively stiff base made of a plurality of plies-of rubbercoveredfabric, said base having a plurality of undercut holes which arestaggered in respect to those in adjacent transverse rowsand said treadportion having homogeneous dovetailed tongues which project into saidholes.

5. A rubber tire consisting of a flexible tread portion, and arelatively stiff base which is interlocked with said tread portion bymeans of projections on one part which enter holes in the other part,and strips of woven-wire fabric resting upon the base portion andembedded in the rubber of tread portion thereof and adapted to beengaged by. wire fastening devices.

6. A rubber tire consisting of a flexible tread portion, and arelatively stiff base which is interlocked with said tread portion bymeans of projections on one part which enter holes in the other part,and two strips of woven-wire fabric projecting from the edge of the tireinward a short distance in contact with the base portion and embedded inthe rubber of the tread portion, combined with a wheel-rn havingoutwardly-Haring side lianges which are litted to the sides of the base,and two fasteningwires external to the tire resting upon the projectingedges of said wire strips within the side flanges of the rim.

In testimony whereof I hereunto aHiX my signature in the presence of twowitnesses.

ARTHUR H. MARKS. Witnesses:

A. H. NOAH, D. GALEHoUsE.

